Shoe sewing machines



SHOE SEWING MACHINES 1s Sheets-She't 1 Filed Oct. 28, 1955 V ana,

3 1 j QM V 4 I lllll rllrilllli March 15, sHwoRTl-l ET AL 2,928,361

SHOE SEWING MACHINES Filed Oct. 28, 1955 18 Sheets-Sheet 2 Fred fls/zworf/v' Joseph 7?? foann/W/ March 15, 1960 F. AsHwoRTH ETAL J 2,928,361

' SHOE SEWING MACHINES Filed Oct. 28, 1955 v 18-Sheet s-Sheet 3 Inventors:

SHOE SEWING MACHINES 18 Sheets-Sheet 4 Filed Oct. 28, 1955 fnventors: f'r'ed flsfm/o/"fh Joseph H Joann/7i Mai-ch 15, 1960 F,'ASHWORTH ET AL 2,928,361 SHOE SEWING MACHINES Filed Oct. 28, 1955 1s Sheets-Sheet 5 March 15, 1960 F. ASHWORTH EI'AL 2,928,361

SHOE SEWING MACHINES 18 Sheets-Sheet '7 Filed Oct. 28, 1955 Inventors:

Joseph E Joann/7 g fhe/k Man}! 15, 1950 F. ASHWORTH ET AL 2,923,361

SHOE SEWING MACHINES Filed Oct. 28, 1955 18 Sheets-Sheet 8' F.- ASHWORTH ET AL March 1511960 SHOE SEWING MACHINES l8 Sheets-Sheet 9 Filed 001:. 28 1955 g Fred flshwar'f/l Jose 0h I Joann/WI March 15, 1960 F. ASHWORTH ETAL 2,928,361

' SHOE SEWING MACHINES Filed Oct. 28, 1955 l8 Sheets-Sheet 10 w w 7 762 5% I 7 fiwentors:

freq qshworfh Joseph I? Joann/ll! March 15, 1960 F. ASHWORTH :TAL 7 2,928,361

SHOE SEWING MACHINES Filed Oct. 28, 1955 18 Sheets-Sheet 11 March 15, 1960 F. ASHWORTH ET AL SHOE SEWING MACHINES Filed Oct. 28, 1955 18 Sheets-Sheet 12 .Z/L%+ lz y 'j 1; 1 3/4/- IZ/fi 1 i E23 5 46 i i 200 2 J/a" Inventors: F/"ed flshworf/r Joseph E Joann/7 March 15, 1960 F. ASHWORTH ETAL 2,928,361

SHOE SEWING MACHINES Filed 001:. 28, 1955 18 Sheets-Sheet 14 a if mn'll ll filll HlHllilll Inventor's.

Fred fls/vworfh Joseph 77". Ioanm/// y [/76/ n? I March 1960 F. ASHWORTH ETAL 2,923,351

SHOE SEWING MACHINES Filed 001;. 28, 1955 18 Sheets-Sheet l5 March 15, 1960 F. ASHWORTH ET.AL 2,928,361

SHOE SEWING MACHINES Filed Oct. 28, 1955 1s Sheets- Sheet 1s Inventors;

Fred 49/2wor/h Joseph I? foanmY/i March 15, 1960 F. ASHWORTH ET AL 2,928,361

SHOE sswmc MACHINES Filed Oct. 28, 1955 18 Sheets-Sheet 17 United States Ptti't SHOE SEWING MACHINES Application October 28, 1955, Serial No. 543,428 7 22 Claims. cl. 112-58) The present invention relates to improvements in straighthook needle lockstitch shoe sewing machines of the McKay type similar to that disclosed in United States Letters Patent No. 2,670,701, granted March 2, 1954, in the names of the present inventors. Many of the features of the present invention, however, are not limited to elfective use with such machines but are applicable with advantage more generally to sewing machines especially intended for operating upon any thick, heavy material.

The general purposes of the present invention are to provide a sewing machine of the nature indicated which will showgreater reliability, operate uponwork of greater thickness and reveal greater freedom from frequent adjustments than corresponding prior machines.

With respect to the provision of a machine for operating upon work of greater thickness than is within the range of prior machines, needle and awl reciprocating mechanisms are .provided similar to those disclosed in an application for United States Letters Patent, Serial No. 409,152, filed February 9,, 1954, in the names of the present inventors, now Patent No. 2,737,134, granted March 6, 1956, the successful operation of which is dependent to some extent upon the construction of universally jointed links for connecting the needle and awl to their reciprocating mechanisms, disclosed in an application for United States Letters Patent, Serial No. 349,872, filed April 20, 1953, now Patent No. 2,767,004, granted October 16, 1956, in the names of the present inventors.

In its preferred form the machine constructed accord-' ing to the features of the present invention includesmechanism for improving the accuracy of thread measurement for each stitch inserted in material of substantial thickness, in which a single member acts as a thread controller for preventing erratic movements of thread en gaging the other stitch-forming devices of the machine and as a thread measuring pull-off engaging the needle thread between a pair of thread locks mounted along the path of the thread running through the machine'at the opposite side of the work from the needle. The use of a single thread engagingmember for both the controller and the pull-off results in less abrasion and wear on the thread than is caused by the use of separate controller and pull-01f members, which abrasion and wear on the thread is an increasing impediment to operation on extremely thick work. In the illustrated form of this feature, a stitch setting loop taker is provided and the combined controller and pull-01f pulls back thread from each stitch before it is set, in an amount less than that required for retraction of the threaded needle from the work. In this way abrasion and wear on the thread being drawn through the work are reduced to a minimum.

Other features of the invention include a novel and improved presser foot mechanism, an improved niounting for a loop spreader on a feed carrier, so arranged that maximum accuracy of alinement with the needle is obtained, a novel and improved form of the thread case retainer actuating mechanism, a variable speed 'looper actuating mechanism of unique effectiveness and. driving and stopping mechanisms providing novel coordination between separate highand low-speed driving clutches, in combination with a lockout member controlled by braking force applied to a driven shaft in the machine through the action of the low-speed clutch, for holding the low-speed clutch in driving engagement until the speed of rotation of the driven shaft has been reduced to a point where it will. coast to a uniform stopping position with certainty. The illustrated stopping mechanism is useful in bringing operating parts of unusually heavy construction reliably to rest in predetermined positions with a minimum of impact. Additional features of the invention, comprising a' novel and improved rotary horn mounting, as hereinafter described and claimed, will become apparent from a consideration of the following detailed specification taken in connection with the accompanying drawings, in which Fig. l is a perspective view looking from the right side and front of a McKay typelockstitch shoe sewing machine in which the features of the present invention are I embodied;

Fig. 2 is a view in right side elevation, partly broken away and on an enlarged scale of the head of the machine'shown in Fig. l; p v Fig. 3 is a view on a reduced scale of the driving and stopping mechanism in the machine showing its arrangement for easy removal and servicing;

Fig. 4 is a rear view of a strut and standard for supporting the driving and stopping mechanism when removed for servicing; l i I Fig. 5 is a detail perspective view on an enlarged scale looking from the right front and above the level of a shuttle and its driving mechanism in the machine of Fig.

ity of illustration; r

Fig; 6 is a sectional view on an enlarged scale of the l, with certain parts broken away and separated for an shuttle, its driving connections and mountings in the machine head frame;

Fig. 7 is a detail view. on a somewhat reduced scale and in front elevation of the shuttle anda portion of a.

sewing work of decreasing thickness;

Fig. 10 is a detail perspective view looking from the right front of themachine and from above,showing the presser foot and its actuating mechanism;

Fig. 1-1 is a sectional front view of the presser foot and acalipering member connected therewith; v

Fig. 12 is a sectional view on an enlarged scale taken along the line XII-XII of Fig. 10;

Fig. 13 is a similar sectional view taken along the line XIII-XIII of Fig. 10;

Fig. 14 is a detailperspective View, looking from the right front of the machine and illustrating particularly a feed carriage for the needle, awl and loop spreader;

Fig. 15 is a sectional view looking from the right side of the machine, showing a driving and stopping mechanism employed therein; I M

Fig. 16 is a detail perspective view looking'froni the rightv front of the machine showing the principal parts of the diiving and stopping mechanism; v

Fig. 17 is a detail plan view, partly in section, of some of the connections in the driving and stopping mechacontracted or expanded relation;

parts taken while 7 Fig. 19 is a detail view in side elevation, partly broken away, of some of the connections shown in Fig. 18;

Fig. 20 is a sectionalplan view of some of the same connections;

Fig. '21 is a view in right side elevation and in section of a rotary horn mounting and ..co mbined thread con troller and measuring device employed in the machine;

Fig. 22 is a sectional detail view on an enlarged scale and in right side elevation of connections in the mechanism for actuating the thread controller shown in Fig. 21;

Fig. 23 is a detail perspective view looking from the right rear of the controller actuating mechanism;

Fig. 24 is aperspective view looking from the left front of a thread lock mechanism which cooperates with the thread controller; I

Fig. 25 is'a detail view in right side elevation and on a reduced scale, partly broken away, of a mechanical relay connected to the calipering member for adjustin the thread measuring mechanism; Fig. 26 is a view in rear elevation of the relay;

Fig. 27 is a perspective view, partly broken away and in section of a portion of the driving mechanism for a needle threading whirl employed in the machine;

. Fig. 28 is a plan view of a spacer frame for the horn mounting, partly broken away to show' the underlying mechanismin section; g

. Fig. 29 is a detailed view on a reduced scale ofa lubricating system employed in the machine;

' Fig. 30 is a plan view on an enlarged scale of the main sewingshaft and its supporting bearings; and

Fig. 31 is a time chart illustrating the operation of the machine. 1

-The illustrated machine is similar, except as hereinafter pointed out, to the lockstitch McKay type, rotary horn shoe sewing machine disclosed in inventors prior Patent No. 2,670,701, identified above. Referring to Figs.*1 and 7. to 9, inclusive, of the drawings, the ma chine is provided with stitch forming devices including a straight reciprocating hook needle 2, a straight awl 4,

a multiple beak deep-toothed shuttle or looptaker 6, and a rotating needle threading looper in the form of a whirl 8 (see Fig. 14) at the upper end of a work support in the form of a rotary shoe entering horn 10, the horn having a needle receiving opening 11 at its upper end in alinement with the needle. To clamp a 'shoe on the horn a presser footlZhaving a forked end is secured to the lower end of a vertically. reciprocating presser foot bar 14 at the side of the work with the needle, the needle passing through the fork in the foot. To actuate the stitch forming devices the machine has mechanisms driven by a main sewing shaft 15 connected to them. I

In order to enable work of greater thickness thanheretofore to be operated upon, the needle and awl of the present machine are actuated with a greater reciprocat ing movement than in prior machines and thele'ng'thsof these work penetrating instruments have been correspondingly increased to accommodate essentialclearances when work up to a thickness of l fli inches is being sewn. For actuating the needle and awl, they are secured to the lower ends of separate reciprocating bars 16 and 18 (Fig. 14) retained for sliding movement within a box-like carrier. 20, the needle moving laterally in a direction of work feed while in engagement with the, work a distance equal tothe length of a stitch to impart feeding movement to the work. 'For a complete disclosure of the mechanism for actuatingthe needle and awl, reference may be had to the patents above referred to of the present, in-

ventors. s

The multiple beakloop taker 6 of the present madrawn through the work by the needle as illustrated in 1 Fig. 7 of the drawings while a loop previously formed 'and carried about a locking thread case within the shuttle is beingcontracted. As eachloop is carried about the locking thread, case the shuttle causes the stitch formed by the preceding loop to be drawn into the work and to be set securely at a predetermined position within the work.

In order to provide thread equal inamount only to that required for each succeeding loop ofthread drawn through the work by the needle, a singlecombined thread controller and pull-oft member 28 is provided, as best shown in Fig. 23. The controller is actuated while each loop of thread is being enlarged by the shuttle to draw back a short length of thread from the work so that it will be available as the threaded needle is retracting from the work with the succeeding loop. The drawback action of the thread controller enables only one-half the length of each needle loop to be paid out at the proper time, the other half being withdrawn through the work from the previously formed stitch.

In the machine ofPatent No. 2,670,701, the thread controller and pull-off are separate members and accordingly engage the needlethread in dilferent positions causing greater abrasion" and wear on a greater length of thread than when the combined controller and pull-off "member of the present invention is employed. Besides requiring a greater length of thread fortwo separate 9 members to operateupon, the twoseparate members are 'subject to greater inaccuracies in their movements than a5 single one. Also, in the prior machine varying qualities of stretch. and elastic recovery in the thread occur, becauseof its greater length than with a single member.

A In the present machine the combined controller and pulloif member is actuated toward and away from the needle thread running between front or upper and rear or lower thread locks 30 and 32 (see Figs. 21 and 24). To pay'out the thread provided by the measuring movements, the thread measuring movements of the controller are adjusted automatically by the thickness of the work operated upon and are timed with relation to the requirements of the other stitch forming devices in a manher to insure satisfactory results. There are two mecha nisms forimparting to the improved thread controller "the desired movements. These mechanisms are best ance with the thickness .of the work and the other i causes the controller to draw back suificient'thread from i .66

shown in Figs. 22 and 23 and contain two cam actuated members. One ,Of the mechanisms causes the controller tqfpull off a length of thread from the supply in accordthe worksoithat'the threaded needle may retract from the .workduring formation of the succeeding stitch "without inducing a sliding movement of the thread engaging the needle hook during the retraction. A proportioning connection is provided between the two cam actuated mechanismsgfor causing'the controller member 28 to draw back a greater amount of thread when operating chineis constructed with five double beaks formed in parallel plates 22 (see Fig. 6) and in a toothed gear ring 24 secured together in aunitary structure,pthe pres;-

ent five-beak shuttle .6 differing from that in the maupon thin. work than when operating upon thick work.

When work of a maximum thickness of 1% inches is being, sewn there is no thread drawn back by the thread controller, the length of thread measured for each stitch the length measured by the pull-01f action.

The thread controller and pull-off member 28 comprises a shielded pulley. rotatably mounted upon the upper armof a lever 34 rotatable on a shoulder screw 36. 1 The screw 36 is mounted at one end in'a lug 37 (see I V I Figs; 21 and 23) projecting withina cylindrical crown chine of Patent No. 2,670,701, by the provisionof anjl 38 isecured atitslower margin by boltapne ofwhich is 

